TRANSISTOR

TRANSISTOR

 

Unknown Value VCC = 9 Volt , R3 = 300 Ω , R2 = 100 Ω, VR3 = 6,3 Volt , What is The Value R1?

ANSWER :

VR2 = VR3 + VBE

        = 6,3 + 0,7

        = 7 VOLT

 

 IR3 = VR3 / R3

        = 6,3 / 300

        = 0,021 A

IR2 = VR2 / R2

        =  7 / 100

        = 0,070 A

VR1 = VCC - VR3

        = 9 - 7

       = 2 VOLT

IR1 = IR2 + IR3

       = 0,070 + 0,021

      = 0,091 A

R1 = VR1 / IR1

     = 2 / 0,091

     = 21,978 Ω